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Hi Raymo,
There probably are some formulas out there somewhere but it would be complicated trigonometry (lots of Sin and Cos equations).
You have to take into account your home latitude, the DEC of your target, the hour angle of the target and refraction of the atmosphere based on the elevation from the ground your target is. Its a moving target so the drift error is always changing.
I think your best bet is to rely on trial and error, make up a table that shows this part of the sky I can go 2mins unguided, this part I can only do 30secs unguided etc.
Bill
Last edited by billdan; 25-05-2018 at 05:52 PM.
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